dpcsup.c
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上传日期:2013-02-24
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文件大小:6k
- /*
- * Adaptec AAC series RAID controller driver
- * (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
- *
- * based on the old aacraid driver that is..
- * Adaptec aacraid device driver for Linux.
- *
- * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * Module Name:
- * dpcsup.c
- *
- * Abstract: All DPC processing routines for the cyclone board occur here.
- *
- *
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/sched.h>
- #include <linux/pci.h>
- #include <linux/spinlock.h>
- #include <linux/slab.h>
- #include <linux/completion.h>
- #include <linux/blk.h>
- #include <asm/semaphore.h>
- #include "scsi.h"
- #include "hosts.h"
- #include "aacraid.h"
- /**
- * aac_response_normal - Handle command replies
- * @q: Queue to read from
- *
- * This DPC routine will be run when the adapter interrupts us to let us
- * know there is a response on our normal priority queue. We will pull off
- * all QE there are and wake up all the waiters before exiting. We will
- * take a spinlock out on the queue before operating on it.
- */
- unsigned int aac_response_normal(struct aac_queue * q)
- {
- struct aac_dev * dev = q->dev;
- struct aac_entry *entry;
- struct hw_fib * fib;
- struct fib * fibctx;
- int consumed = 0;
- unsigned long flags;
- spin_lock_irqsave(q->lock, flags);
- /*
- * Keep pulling response QEs off the response queue and waking
- * up the waiters until there are no more QEs. We then return
- * back to the system. If no response was requesed we just
- * deallocate the Fib here and continue.
- */
- while(aac_consumer_get(dev, q, &entry))
- {
- int fast;
- fast = (int) (entry->addr & 0x01);
- fib = (struct hw_fib *) (entry->addr & ~0x01);
- aac_consumer_free(dev, q, HostNormRespQueue);
- fibctx = (struct fib *)fib->header.SenderData;
- /*
- * Remove this fibctx from the Outstanding I/O queue.
- * But only if it has not already been timed out.
- *
- * If the fib has been timed out already, then just
- * continue. The caller has already been notified that
- * the fib timed out.
- */
- if (!(fibctx->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
- list_del(&fibctx->queue);
- dev->queues->queue[AdapNormCmdQueue].numpending--;
- } else {
- printk(KERN_WARNING "aacraid: FIB timeout.n");
- continue;
- }
- spin_unlock_irqrestore(q->lock, flags);
- if (fast) {
- /*
- * Doctor the fib
- */
- *(u32 *)fib->data = cpu_to_le32(ST_OK);
- fib->header.XferState |= cpu_to_le32(AdapterProcessed);
- }
- FIB_COUNTER_INCREMENT(aac_config.FibRecved);
- if (fib->header.Command == cpu_to_le16(NuFileSystem))
- {
- u32 *pstatus = (u32 *)fib->data;
- if (*pstatus & cpu_to_le32(0xffff0000))
- *pstatus = cpu_to_le32(ST_OK);
- }
- if (fib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
- {
- if (fib->header.XferState & cpu_to_le32(NoResponseExpected))
- FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
- else
- FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
- /*
- * NOTE: we cannot touch the fibctx after this
- * call, because it may have been deallocated.
- */
- fibctx->callback(fibctx->callback_data, fibctx);
- } else {
- unsigned long flagv;
- spin_lock_irqsave(&fibctx->event_lock, flagv);
- fibctx->done = 1;
- up(&fibctx->event_wait);
- spin_unlock_irqrestore(&fibctx->event_lock, flagv);
- FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
- }
- consumed++;
- spin_lock_irqsave(q->lock, flags);
- }
- if (consumed > aac_config.peak_fibs)
- aac_config.peak_fibs = consumed;
- if (consumed == 0)
- aac_config.zero_fibs++;
- spin_unlock_irqrestore(q->lock, flags);
- return 0;
- }
- /**
- * aac_command_normal - handle commands
- * @q: queue to process
- *
- * This DPC routine will be queued when the adapter interrupts us to
- * let us know there is a command on our normal priority queue. We will
- * pull off all QE there are and wake up all the waiters before exiting.
- * We will take a spinlock out on the queue before operating on it.
- */
-
- unsigned int aac_command_normal(struct aac_queue *q)
- {
- struct aac_dev * dev = q->dev;
- struct aac_entry *entry;
- unsigned long flags;
- spin_lock_irqsave(q->lock, flags);
- /*
- * Keep pulling response QEs off the response queue and waking
- * up the waiters until there are no more QEs. We then return
- * back to the system.
- */
- while(aac_consumer_get(dev, q, &entry))
- {
- struct hw_fib * fib;
- fib = (struct hw_fib *)entry->addr;
- if (dev->aif_thread) {
- list_add_tail(&fib->header.FibLinks, &q->cmdq);
- aac_consumer_free(dev, q, HostNormCmdQueue);
- wake_up_interruptible(&q->cmdready);
- } else {
- struct fib fibctx;
- aac_consumer_free(dev, q, HostNormCmdQueue);
- spin_unlock_irqrestore(q->lock, flags);
- memset(&fibctx, 0, sizeof(struct fib));
- fibctx.type = FSAFS_NTC_FIB_CONTEXT;
- fibctx.size = sizeof(struct fib);
- fibctx.fib = fib;
- fibctx.data = fib->data;
- fibctx.dev = dev;
- /*
- * Set the status of this FIB
- */
- *(u32 *)fib->data = cpu_to_le32(ST_OK);
- fib_adapter_complete(&fibctx, sizeof(u32));
- spin_lock_irqsave(q->lock, flags);
- }
- }
- spin_unlock_irqrestore(q->lock, flags);
- return 0;
- }